TY - JOUR
T1 - Influence of admixed lactose on pelanserin hydrochloride release from hydroxypropyl methylcellulose matrix tablets
AU - Espinoza-Ramos, Rogelio
AU - Villafuerte-Robles, Leopoldo
PY - 1999/12
Y1 - 1999/12
N2 - Pelanserin, a weakly basic experimental drug with a short half-life, was taken as a model to study the influence of lactose on hydroxypropyl methylcellulose matrices to modulate a gradual release. Powder mixtures were wet-granulated with water and compressed in a hydraulic press at 55 MPa. Dissolution media were 900 ml HCl 0.1 N, the first 3 h and phosphate buffer pH 7.4, 3 to 8 h. Dissolution curves were described by M(t)/M(inf)=kt(n), applied separately for each dissolution medium. Dissolution mechanism involved diffusion/relaxation with a linear trend favoring the diffusion mechanism with increasing lactose concentrations. Increasing lactose concentrations produced higher kinetic constants, in a cubic relationship. A double HPMC proportion produced slower dissolution rates, with a more gradual lactose release but including certain degree of erosion. High lactose concentrations compensated for a decreased solubility of pelanserin at pH 7.4. Copyright (C) 1999 Elsevier Science B.V.
AB - Pelanserin, a weakly basic experimental drug with a short half-life, was taken as a model to study the influence of lactose on hydroxypropyl methylcellulose matrices to modulate a gradual release. Powder mixtures were wet-granulated with water and compressed in a hydraulic press at 55 MPa. Dissolution media were 900 ml HCl 0.1 N, the first 3 h and phosphate buffer pH 7.4, 3 to 8 h. Dissolution curves were described by M(t)/M(inf)=kt(n), applied separately for each dissolution medium. Dissolution mechanism involved diffusion/relaxation with a linear trend favoring the diffusion mechanism with increasing lactose concentrations. Increasing lactose concentrations produced higher kinetic constants, in a cubic relationship. A double HPMC proportion produced slower dissolution rates, with a more gradual lactose release but including certain degree of erosion. High lactose concentrations compensated for a decreased solubility of pelanserin at pH 7.4. Copyright (C) 1999 Elsevier Science B.V.
KW - HPMC, sustained release
KW - Lactose
KW - Pelanserin
KW - Release mechanism
KW - pH effect
UR - http://www.scopus.com/inward/record.url?scp=0033398478&partnerID=8YFLogxK
U2 - 10.1016/S0031-6865(99)00020-5
DO - 10.1016/S0031-6865(99)00020-5
M3 - Artículo
SN - 0031-6865
VL - 74
SP - 65
EP - 71
JO - Pharmaceutica Acta Helvetiae
JF - Pharmaceutica Acta Helvetiae
IS - 1
ER -